Kim Kardashian, Kris Humphries Enjoy Rehearsal Dinner

With the big day fast approaching, Kim Kardashian and fiancé Kris Humphries celebrated their wedding rehearsal dinner with friends and family Thursday night at Scarpetta, an Italian eatery inside the Montage Beverly Hills hotel.

“They both looked amazing and very happy to be celebrating their upcoming wedding,” an eyewitness tells PEOPLE of the soon-to-be newlyweds. Adds a hotel source: “Kim and Kris rented the whole restaurant for their special celebration.”

About 75 people were in attendance at the three-hour event, including Kim’s stepfather Bruce Jenner, and sisters Khloe, who Tweeted “such an amazing night with my family and friends,” and Kourtney, who arrived with boyfriend Scott Disick and their son Mason.

Guests enjoyed a cocktail reception followed by a lavish sit-down dinner. “Kim and Kris were hand-in-hand and side by side for most of the night,” says the witness. “Kim was beaming and looked absolutely gorgeous. During dinner, there were some heartfelt speeches and tears, but mostly laughter. Everyone seemed to have a great time.”

The celebration went on well into the evening and several guests gushed about the celebration. “Everyone is excited for the wedding,” one guest told PEOPLE. Kim, included. “What a fun night w family & friends!” she Tweeted late Thursday. “Now I’m sleeping in late tomorrow!”

Excitement may have thwarted those plans though. Early Friday morning, Kardashian followed up with: “Even when I could sleep in I woke up early! Great workout @Gunnar!!!”

• With reporting by PERNILLA CEDENHEIM

For exclusive personal photos from Kim’s fairytale wedding and all the details, pick up the new issue of PEOPLE, on newsstands next week